FormSchema New Performance Architecture

This MR introduces a new API to be able to easily maintain and improve the code base.

Features

• Support of JSON Schema draft-07 (#83 (closed))
• TypeScript (#151 (closed)): prevent unexpected issues on the development phase, improve the code base stability
• Advanced Nested Objects Support
• Array Object Support (#161 (closed))
• Sortable Array Support
• Advanced Native Elements: now each JSON Schema type (string, boolean, array, object...) has its own component for rendering
• New Custom Elements API
• UI Schema Descriptor (#152 (closed))
• Improve Support of Array Elements
• Improve Support of Grouped Checkboxes
• Lighter bundle
• Introduce Playground (replace the demo app)
• Ability to disable form inputs (#154 (closed))
• Custom Validation API (#93 (closed), #128 (closed), #149 (closed))

Changes

• Complete rewrite
• Remove useless FormSchema props: action, autocomplete, enctype, method and novalidate.
  User is still able to defined them by using attributes on FormSchema definition.

  <FormSchema :schema="schema" method="post"/>

• Prop schema is now required
• Async Schema Usage updated (see README file)
• Reactive schema: use vue watcher to rerender on change

TODO

• Demo: Display updated model on Playground view
• Doc: Update README's FormSchema API section
• Doc: Horizontal Layout (#159 (closed))
• Doc: Custom Validation (#93 (closed), #128 (closed), #149 (closed))
• i18n: Explain how to translate labels (#160 (closed))

Playground

npm run playground

Once this MR will be merged, closes #83 (closed), #93 (closed), #128 (closed), #141 (closed), #149 (closed), #151 (closed), #152 (closed), #154 (closed), #159 (closed), #160 (closed), #161 (closed) and #163 (closed)